*{margin:0px;padding:0px;}
body,html{
    padding:0;
    margin: 0;
    width: 100%;
    height: auto;
}
.main-content{
    height: auto;
}
.nav-bar{
    height: 5rem;
    background-color: #FFFFFF;
    box-shadow: 5px 3px 10px #888888;
}
.nav-bar .nav-logo{
    width: 5rem;
    height: 5rem;
    line-height: 5rem;
    text-align: center;
    margin-left: 2rem;
    cursor: pointer;
    display: inline-block;
}
.nav-bar .nav-logo .nav-img{
    display: inline-block;
    width: 100%;
    margin-top: 1.5rem;
}
.nav-bar .nav-choose{
    width: 10rem;
    height: 5rem;
    float: right;
    line-height: 5rem;
    margin-right: 3rem;
}
.nav-bar .nav-choose .nav-login{
    display: inline-block;
    width: 20%;
    cursor: pointer;
}
.nav-bar .nav-choose .nav-login:hover{
    color:red;
}
.nav-bar .nav-choose .nav-register{
    display: inline-block;
    width: 40%;
    margin-left: 0.5rem;
    height: 100%;
    cursor: pointer;
}
.nav-bar .nav-choose .nav-register:hover{
    color:red;
}